Well if you're asking how much is too much for one occasion, then I would say there is no real concrete answer. Like I can't really understand your post 100%(some parts I don't quite follow at all, sorry, not an insult.. youre just on a lot of benzos) because you're leaving out important words and your statements are kind of mixed together without context, so I would say you are on enough... maybe too much? I mean it depends what your responsibilities are.. I would not drive anywhere.. you also have to think about the comedown from using high doses of benzos and the reduced ability to reason which could result in you continuing to use phenazepam at high doses daily.
Like for most people I would say 10mg(spaced at least a week apart or more)TOPS, I suppose your tolerance is much higher than most peoples', so you could take more I guess if it is a one time thing....but to me it's completely reckless sounding. Seriously even if it's better than weed(not sure if thats what you were saying lol), which is odd(large doses of phenazepam just make me unable to like focus on anything), the side effects and risks both short term and long term of phenazepam are infinitely higher even if you are already dependent on benzos it's no good.------------in my experienced opinion---------------
Also phenazepam, from all the reports I've read and people I've let try it and my own experience, is one of the least recreational/fun/useful benzos... so it's no wonder that you need to take so much to get a recreational effect... just know that just because it takes that much for it to become useful doesn't mean it isn't
TOTALLY fucking over your benzo tolerance...
Have fun while it lasts though..seriously!

Just please use self control or try...I'm not saying you aren't, I totally understand being "reckless/bingeing" for a couple of days on a drug(just don't continue random doses of phenazepam every day or honestly even every other day/etc).
So yeah there is really nothing else to say except good luck!